Iinsng-iviachine



(NO Model.)

G D. WHITGOMB. Mining Machine.

Patented Sept. 28,1880.

UNITED STATES PATENT Orrien.

'GEORGE D. WVHITOOMB, OF CHICAGO, ILLINOIS, ASSIGNOR OF THREE- FOURTHS OF HIS RIGHT TO SARAH HARRISON, JOHN J. HARRISON, AND ORANGE BUTLER, OF \VAYNE, MICHIGAN.

MlNlNG-lVlACHINE.

SPECIFICATION forming part of Letters Patent No. 232,792, dated September 28, 1880.

Application filed March 19, 1880. (No model.)

To all whom 'it may concern:

Be it known that I, GEORGE D. WHiTcoMB, a citizen of the United States, residing at Chicago, in the State of Illinois, have invented Improvements in Mining-Machines, of which the following is a specification.

My invention relates to certain improvements in that class of coal-mining machines described in Patents Nos. 198,610 and 219,090, granted to Jonathan W. Harrison on December 25, 1877, and September 2, 1879, respectively.

My invention consists in the applying of a slide-valve operated by a suitable cam rotated by a single eccentric engine for controlling the supply and exhaust of a double-actin g mining-engine.

Myinvention'consists, further, of a combination of circular ratchets upon the supportingwheels and suitable pawls operating in the same, said pawls being protracted by a spring and retracted by a cam under the control of the operator.

My invention further relates to a pair of ad- 2 5 justable handles, which may be shortened or lengthened, or removed altogether, as desired.

My invention further relates to a peculiar shape of pick.

In the accompanying drawings, Figure 1 represents a rear view of a coal-mining machine embodying my improvements, the supporting-wheels being partly broken away to exhibit the ratchet and journal. Fig. 2 is a longitudinal vertical section through the axis of cylinder. Fig. 3 is a plan view of one side of the machine. Figs. 4 and 5 are side and edge views of the pick. Fig.6 is a plan view of the pawls and accessories. Fig. 7 shows the bushing through which the pick-holder slides. Fig. 8 is a perspective view of the slide-valve and its oscillating cup-guide. Fig. 9 is a vertical section through the line 9 9, Fig. 6. Fig. 10 shows another form of pickholder.

A may represent two wheels supporting a cast cylinder, B, journaled in them. A wroughtiron or steel shaft, a, cast or otherwise fixed into the projecting lugs b, which extend from thetsides of the cylinder for that purpose, constitutes the axle, which, by virtue of its material, is proof against breakage from the concussions of the machine. Surmounting the cylinder is a steam chest, 0, inclosing the slide-valve D and its operating-cam E. The cam E is operated by a single eccentric rotary engine, F, which runs independently of the rest of the machine. The shaft f of this engine extends through the casing and has a hand-wheel, f, keyed to it for the purpose of starting the eccentric.

I prefer to make the slide-valve balanced, as shown, and upon its upper face I cast two annular arcs, d, which serve to guide a horizontally oscillating cup (1, said. cup being slotted at 0 upon its upper face for the reception of the cam E. The free motion of this cup allows it to adjust itself perfectly to the varying direction of the cam E, and by so doing obviates all unnecessary wear.

The piston-rod stuffing-box G projects sufficiently from the cylinder-head to allowjof being screw-threaded on its outer side, upon which is screwed the pick-holder sleeve H,the outer end of which has a bushing, h, screwed into it, the non-circular opening in which corresponds to the shape of the pick-holder I, which slides in it, these parts being all constructed the same as in the before-mentioned patents.

Attached on the upper side of the steamchest 0 is a rectangular box, J, which serves as a guide to two pawls, K, that, by engaging in the circular ratchets L on the inside of the supporting wheels, prevent any retrograde motion of the machine.

A spring, M, serves to protract the pawls, while an S-s'haped cam, N, pivoted at a and impinging against the pins k, which extend from the pawls through the slots j, enables the operator, by means of rod 0, to retract the pawls whenever it is desired to back the machine.

In order toconveniently'handle the machine I provide two arms, P, which slide in guides Q, and are held in any desired position by means of pins (1 in said guides and holes 19 in the arms. By this means of adjustment the machine can be made to occupy the smallest possible space when required.

The pick R is of the represented chisel form, the bevel being wholly on one side. .This prevents the pick from glancing at each thrust, and thus relieves the machine of any side pressure. The edge of the pick has a V-shaped notch, as shown, so that the wear of the tool does not destroy the points so quickly.

I also provide a shoulder, S, upon the pick, which, resting against the end of the pick holder, affords a solid abutment for withstanding the shock of the blow.

The rear end of the pick is inserted into a hole in the end of the pick-holder I, and has a slot, T, for receiving a key, it, which, passing through a corresponding slot, i, in the pickholder I, secures the pick in place. The pickholder I may have an additional slot, Z, as shown in Fig. 10, immediately in rear of the pick, for the purpose of inserting a wedge for dislodging the pick in case it should be difficult to remove.

A gear-wheel, U, on the rear end of the sleeve H, meshes with a pinion,-V, having onefourth the number of teeth. This pinion is keyed to a shaft, W, on the other end of which is a winch, X, by means of which the sleeve H and pick B may be rotated by the operator into any desired position.

A projection, 00, from the handle X, springs into a hole, w, in the rear cylinder-head, whereby the pick may be held in any one of four different positions.

Having thus described my invention, the following is what I claim as new and desire to secure by Letters Patcnt- 1. In a mining-machine, the slide-valve D,

operated by a rotating cam, E, said cam be- 4.0

ing driven by a rotary engine, F, substantially as described.

2. In a mining-machine, the combination of slide Valve D, annular arcs d, oscillating cup d, and rotating cam E, substantially as and 5 5. The chisel-shaped pick R, having the V- 55 shaped notch in its edge, substantially as and for the purpose set forth.

GEORGE D. WHITOOMB.

Witnesses:

JAMES DALZELL, WALTER DALZELL. 

